Final answer:
The idea that babies smile because they know it's cute to enhance survival is related to reflex behaviors like grasp and suckling, which are critical for an infant's survival as they keep them close to caregivers and enable feeding.
Step-by-step explanation:
The statement suggesting that babies smile because they know it is cute to increase their chance of survival can be related to biology, as it touches on the evolutionary behaviors observed in infants to ensure their well-being and care from adults. Reflex behaviors such as the sucking reflex and the grasp reflex are instinctive responses that serve important survival functions. In the context of the grasp reflex, where a baby instinctively grasps an object, it could be theorized that such behavior might have evolved to promote survival by ensuring infants remain close to their caregivers and are less likely to be dropped, leading to increased safety.
During the early stages of human evolution, babies who were able to maintain close physical contact with their parents may have been more likely to receive the necessary care and protection needed during this vulnerable period, thereby increasing their chances of surviving into adulthood. As parental care is extensive in species with only a few offspring, such as humans, the development of gripping, sucking, and crying reflexes has become critical to an infant's development and survival.